The influence of latitudinal gradient on sugar concentration in the nectar of Taraxacum officinale Wigg.
This article analyses the dynamics of sugar concentration in the nectar of Taraxacum officinale Wigg. in the arctic, boreal and temperate zones of Russia. The author arrives at the conclusion that the sugar productivity of flowers analysed changes throughout the day. The average sugar production in T. officinale flowers increases towards ...
Ontogenetic Dynamics of Hydrocortisone Quantitative Content of the Common Octopus Octopus vulgaris, Lamark (Cephalopoda: Octopodidae)
The article describes the quantitative content dynamics of the hydrocortisone steroid hormone in different organs and tissues in the course of the common octopus ontogenesis. The author detects general patterns of its quantitative distribution in the octopus organism and formulates a hypothesis on the functional significance of hydrocortisone in the examined tissues of mollusks.
Hydrocortisone level is one of the most important organizers of general adaptation syndrome in the organisms of vertebrates...
Ontogenesis of Dracocephalum nutans L. and Dracocephalum grandiflorum L. in the Alma-Ata region
Gontsch. в естественных условиях и в культуре // Вестник КазГУ. Сер.
биологическая. Алматы, 2000. №
1 (9). С. 26—36.
ontogenesis, officinal herbs, population age structure, introduction.
The endocrine function organization in flatworms
This article focuses on the endocrine function in flatworms. It is implemented with the help of two groups of hormones. Several centres of neurosecretory cell localisation were discovered in the nervous system of flatworms. The hormonal signal is transmitted with the help of adenylate cyclase system, which is peculiar to vertebrates. Endogenous steroids – sex steroids and glycocorticoids
— were detected in some flatworm species. These data suggest that flatworms have an endocrine system, whose structural...